Cylinder for internal-combustion engines



H. R. SETZ. CYLINDER FOR INTERNAL coII/IBUSTION ENGINES.

-APPLICATION FILED APRu Il Patent-ed; Deo. 5, 1922,

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HIV A INVENTQR Hans @.SZ

BY IIQWEEIQ.

i ATTQRNEYS H. R. sm. n CYLINDER FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED APR. Il, 1921.

Pat-md. Die@ 5, 1922 2 SHEETS-SHEET 2.

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HANS R4 SETZ, OF MANI'TOVv/'OC` WISCONSIN.

CYLINDER FOR INTERNAL-COMBUSTION ENGINES.

Application led April 11, 1921 To 117/r 'HY/20m, if may conce/11:

lle it. known that l. llixs li. Slew.. a citizen ot the United States. residing at Mani towoc. visconsim have invented a certain new and useful ll'uprovement in ty'linders tor Internal-t`oinhustiou llngines. oi' which the. following-is a full, clear.` andcxact dcsc-ription. such as will enable others skilled in the art to which it appertains to make and use the same. l

This invention'relates to cylinders tor two cycle internal combustion engines o fthe kind in which scavenging ports and exhaust ports are arranged in the inner wall ot the cylinder in proximity to each other.

The main object ot my invention is to provide an engine cylinder ot the general type referred to which so constructed that the inner wall of same will not warp out of its true axial position. dile to the unequal heating ot the two portions ot' the inner wall that contain the exhaust and savenginef ports.

tTo this end l have .devised an internal combustion engine cylinder having an inner wall equipped with. exhaust ports and .scavenging ports arranged in a zone common to both sets ot ports and composed ot a` plurality ot sections that are separated trom each other hy a space or ljoint which permits said sections to expand and contract longitudinall)Y with relation to each other suiiiciently to compensate tor the relatively higher temperature ot that portion ot the inner wall ot theeylinder in which the exhaust ports are formed. 'lhe inner Wall of the cylinder is preferably formed hy two liners or open-ended cylindrical members arranged end to end and separated from each other hy a joint or space that ex- `tends eircumferentially around the cylinder in the zone that contains the scavenging ports and exhaust ports. and a supporting means is provided for said liners to which the outer end portions ot the liners are rigidly connected, thereby permitting the in-v ner end portions of the liners that contain theI ports to expand and contract longitudinally with relation to each other when the engine is in operation. y

In the form of my invention herein illustrated the supporting means in which the' cylinder liners are arranged4 andto which the outer end portions of said liners are rigy.

idly connected consists of an outer jacket Wall provided with means for eoolingthe Serial No. 460,534. l

parts ot the inner wall ol' the cylinder that lie hetwcen the ports. said cooling means pretcrahly consisting oly water cooled portions on the outer jacket wall that hack up the parts ot the inner wall lying hctween' the ports. and thus prevent said parts trom acquiring excessively high temperatures` The jointI or space between the inner ends ot the two liners or sections that constitute the inner wall of the cylinder can he formed in various ways without departing from the spirit ot my invention. and any suitable means can he employed to prevent communication trom the exhaust port side ot the cylinder to the scavenging port side ot` the cylinder through the expansion gap or joint between-the two cylinder liners.-

Figure l of the drawings is a vertical longitudinal sectional view ot a. double acting cylinder tor' two cycle internal comhustion engines constructed in accordance with my invention.

lligure r2 is a horizontal sectional view.

`taken on the line A-A Io'l Figure l.

Figure 3 is a vertical longitudinal.sectional view. illustrating a slight. modification oimy invention applied toa single acting cylinder; and i Figure t is a fragmentary horizontal section ot' the c vlinder shown .in Figure 3, taken along the line li--B ot' Figure il.

Referring to Figures l and 2 otl the drawings. l and Q designate two liners or openeuded tuhular memhcrs arranged end to end so as to torni the inner wall ot a ovlinder,` and designates a supporting means in which said liners are mounted. ln the torni ot my invention'herein illustrated the supporting means 3 consists ot an outer jacket wall to which the outer end portions ot` the liners 'l and 2 are rigidly connected oy tastening devices 3, or in any other suitable manner, that will permit the inner end portions of said liners to expand and contact longitudinally with relation to each other.v The inner ends of the liners l. and 2 are sepa'- rated from each other by a gap et of sufii cient Width to permit unrestricted expansion of said liners under the influence of the Working temperatures, and exh'iust ports 5 and scavenging ports 6 aie arranged in the inner wall of the cylinder preferably opposite each other, as shown injFigure l, said ports being formed by slots cut through `the inner end portions of both sections or liners co-opcrate with each other to form-oblong or rectangularlyshapcd ports when the two sections l and re in operative. position in the belt section The portion ot thc outer' jacket wall 3 which surroumls the zone ot the inner wall of the cvliniler that contains the exhaust ports and scavenging ports and (i, respectively, is provided with corresponding ports or openings, and said outer jacket wall is preferably equipped with water cooled portions 7 and 8 that respectively back up thc parts T of the inner wall ot the cylinder lying between the exhaust ports 5 and the parts 8 ot' the inner wall of the cylinder lying between the scavenging ports G.

The waten cooled portions 7 and 8 of the outer jacket wall 3 are. continuous and are in direct connnunication with the water jackets formed by the annular space .fr between the cylinder liner l and the upper portion of the outervjacket wall Band the annular' space 1/ formedjbetween the liner 2 and the lower portion of the jacket wall 3, said liners being provided at their inner ends with portions that are slidably fitted in the intermediate portion ,a of the outer acket wall 3. In view of the fact that the water cooled portions 7 and 8 of the outer jacket wall 3 are in direct contact with the vertically-disposed bar-like parts 7a and 8a of the inner wall of the cylinder that lie between the ports, said parts will be effectively cooled, notwithstanding the fact that said parts are of such construction that they can expand and contract longitudinally.

lith such a construction each of the vertically-disposed bar-like parts of the inner wall of the cylinder lying between two ports is permitted to go through its own unrestricted process of contraction and expansion, according to the temperature to which it is exposed, due to the function of the ports between which it is arranged. Thus the barlike parts which are arranged vbetween the exhaust ports will naturally get hotter than the corresponding parts between the scavenging ports and are permitted to expand in accordance with their mean temperature. At the same time the water cooled portions T and 8 of the outer jacket wall 3, by virtue of the fact that they back up the uncooled parts 7 and 8a, respectively, of the inner wall of vthe cylinder, prevent the latter from acquiring excessively' high temperatures. Consequently, warping of the cylinder out of its true axial position is eliminated.

The expansion gap or joint 4 between the two sections l and 2. constituting the inner" wall of the cylinder is preferably made irregular or ot' such form that the expansion joints between the consecutive bar-like parts Vof the inner wall between the ports are staggered so as to facilitate easy travel of the piston rings over the'joint between the two liners 1 and 2. Provision is also made to prevent communication from the exhaust port side of the cylinder to the scavenging port side through the expansion gap 4, and in the form of my invention shown in Figures l and 2 this is accomplished by interrupting the gap 4, as shown in Figure l, and providing the cylinder liner 1 with portions l having vertically-disposedr surfaces that bear snugly against and slide upon vertically-disposed surfaces on portions 2fL on the liner 2. lith an expansion, joint of the form above described it is possible for the liners l and 2 of the cylinder to expand and contract longitudinally with relation to each other without liability of communication being` established between the two parts of the expansion gap lying on opposite sides of the vertical contact surfaces on the co-operating portions lu and 2n of the cylinder liners.

In Figures 3 and 4 of the drawings I have illustrated a single acting cylinder for two cycle internal combustion engines that has the 'same desirable features and characteristics of the cylinder shown in Figures l and 2, but provided with a different means for preventing the expansion gap from establishing communication between the two sides of the. cylinder in which the scavenging ports and exhaust ports are formed. In the form of my invention shown in Figures 3 and 4 axiallyedisposed key pieces 9, only one of which is shown, are inserted between the co-operating portions 1vl and 2a of the cylinder liners l and 2, respectively, thus providing sliding Contact surfaces which permit longitudinal expansion and contraction ot' either liner, but effectively cutting off communicationv between the exhaust ports and scavenging ports. Any suitable means can be used for retaining the key pieces 9 in position, such, for example, as machine screws l() inserted from the outside of the belt section 3, as shown in Figure 4.

It is, of course, immaterial, so far as my broad idea is concerned, how the cylinder .sections or liners l and 2 are mounted, so long as they are mounted in such a manner that the inner end portions of same in proximity to the exhaust and scavenging ports can expand and contract longitudinally with relation toeach other. For example, in Figures l and 2, the liners l and 2 are of cylindrical form and are centered at their outer ends in bored seats in a supporting means 3 and rigidly'connected to same by fastening devices 3a which pass through fianges on the outer ends of said liners. Or the liners can be mounted in the manner illustrated in Figures 3 and 4, wherein each of the liners is provided at its outer end with an integral, short outer wall jacket section that bears upon the supporting means or the formation of the scavenging and exhaust outlet in the outer jacket wall 3 inthe form shown in Figure 2, namely, provide said ex! hau'st outlet with aA center water cooled portion 7b running clear through to the outer face of the cylinder, and thus virtually producing `two exhaust outlets, this is not essential, for if desired, said partition ,7" can be replaced by a water cooled portion similar' to the water cooled portions that back up the parts 7 of the inner wall located between the exhaust ports 5 of the cylinder.

Having thus described my invention` what I claim as new and desire to secure by Letters Patent, is: v

l. A cylinder for two cycle internal combustion engines, comprising an innerwall composed of two separate sections arranged in axial alignment, scavenging and exhaust ports formed in the adjacent ends of said inner wall sections, and an outer wall sec-` tion provided with ports that coordinate with the ports in said inner wall and having portions 1n engagement with the inner wall portions lying between said ports.

2. A cylinder fortwo cycle internal combustion engines, comprising an inner wallv composed of two separate sections arranged in axial alignment, scavenging and exhaust ports formed in the adjacent ends of said inner wall sections, an outer wall Section provided with ports that coordinate with the ports in said innerwall, and water-cooled portions on said outer wall section that bear directly against the portions ofthe inner wall lying between the ports therein.

bustion 3. A cylinder for two cycle internal combustion engines having an inner equipped with exhaust ports and scavenging ports arranged in a common plane in opposite sides ot said inner wall and composed ot two sections arranged end to end and separated from each other by an expansion gap or joint that extends circumferentially around the cylinder through said ports, and means for preventing said expansion gap from establishing communication between the ports in the opposite sides ofthe inner wall of the cylinder.

4. A cylinder tor two cycle internal comengines having an inner wall equipped with oppositely-disposed exhaust ports andv scavenging ports and composed of two liners arranged end to end and separated from each other by an expansion joint that extends circuinferentially of the cylinder in proximity toy said ports, an outer jacket wall to which the outer end portions ot said liners are rigidly connected and provided with means'in which the inner' end portions of said liners are slidably fitted, water cooled portions on said outer jacket wall that bear directly against and thus back up the parts of the inner wall of the cylinder lying between the ports in said wall, and means for preventing said expansion joint from establishing communication between the exhaust ports and 'scavenging ports.

A cylinder for two cycle internal combustion engines, comprising aninner wall composed of two sections arranged in axial alignment and sepa-rated from each other by a circu1nferentially,disposed expansion gap, scavenging and exhaust ports in the adjacent ends of said inner wall sections, an outer jacket wall surrounding the inner wall sections in the zone of said ports, and means for preventing' communication between the exhaust and scavenging ports through said expansion gap.

HANS R. sErz.

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